C# 3个线程A B C 依次打印123123123..

 1  class Program
 2     {
 3         static void Main(string[] args)
 4         {
 5             var mt = new MyThread();
 6             mt.Run();
 7 
 8             Console.ReadLine();
 9         }
10     }
11 
12     
13    internal class MyThread
14    {
15        private int number = 0;
16        object obj = new object();
17 
18         public void Run()
19         {
20             var ta = new Thread(PrintNumber);
21             var tb = new Thread(PrintNumber);
22             var tc = new Thread(PrintNumber);
23 
24             ta.Start("1");
25             tb.Start("2");
26             tc.Start("3");
27         }
28 
29        private void PrintNumber(object num)
30        {
31            for (int i = 0; i < 9; i++)
32            {
33                lock (obj)
34                {
35                    if (Convert.ToInt32(num) == number + 1 || Convert.ToInt32(num) == number - 2)
36                    {
37                        Console.Write(num);
38                        number = Convert.ToInt32(num);
39 
40                        // 通知正在等候的线程
41                        Monitor.PulseAll(obj);
42                    }
43                    else
44                    {
45                        // 本轮不应该打印的线程，就让他到lock外面等候通知
46                        // 因为本次他也执行了判断，所以循环就少了一次
47                        i--;
48                        Monitor.Wait(obj);
49                    }
50                }
51            }           
52        }
53     }